370 lines
10 KiB
C#
370 lines
10 KiB
C#
// Author: Dwivedi, Ajay kumar
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// Adwiv@Yahoo.com
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.Collections;
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using System.Xml.Serialization;
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using System.ComponentModel;
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using System.Xml;
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using Mono.Xml;
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using Mono.Xml.Schema;
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namespace System.Xml.Schema
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{
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/// <summary>
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/// Summary description for XmlSchemaXPath.
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/// </summary>
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public class XmlSchemaXPath : XmlSchemaAnnotated
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{
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private string xpath;
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XmlNamespaceManager nsmgr;
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internal bool isSelector;
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XsdIdentityPath [] compiledExpression;
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XsdIdentityPath currentPath;
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public XmlSchemaXPath()
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{
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}
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[DefaultValue("")]
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[System.Xml.Serialization.XmlAttribute("xpath")]
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public string XPath
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{
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get{ return xpath; }
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set{ xpath = value; }
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}
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internal override int Compile(ValidationEventHandler h, XmlSchema schema)
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{
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// If this is already compiled this time, simply skip.
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if (CompilationId == schema.CompilationId)
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return 0;
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if (nsmgr == null) {
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nsmgr = new XmlNamespaceManager (new NameTable ());
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if (Namespaces != null)
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foreach (XmlQualifiedName qname in Namespaces.ToArray ())
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nsmgr.AddNamespace (qname.Name, qname.Namespace);
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}
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currentPath = new XsdIdentityPath ();
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ParseExpression (xpath, h, schema);
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XmlSchemaUtil.CompileID(Id, this, schema.IDCollection, h);
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this.CompilationId = schema.CompilationId;
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return errorCount;
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}
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internal XsdIdentityPath [] CompiledExpression {
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get { return compiledExpression; }
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}
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private void ParseExpression (string xpath, ValidationEventHandler h, XmlSchema schema)
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{
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ArrayList paths = new ArrayList ();
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ParsePath (xpath, 0, paths, h, schema);
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this.compiledExpression = (XsdIdentityPath []) paths.ToArray (typeof (XsdIdentityPath));
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}
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private void ParsePath (string xpath, int pos, ArrayList paths,
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ValidationEventHandler h, XmlSchema schema)
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{
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pos = SkipWhitespace (xpath, pos);
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if (xpath.Length >= pos + 3 && xpath [pos] == '.') {
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int tmp = pos;
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pos++;
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pos = SkipWhitespace (xpath, pos);
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if (xpath.Length > pos + 2 && xpath.IndexOf ("//", pos, 2) == pos) {
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currentPath.Descendants = true;
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pos += 2;
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}
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else
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pos = tmp; // revert
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}
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ArrayList al = new ArrayList ();
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ParseStep (xpath, pos, al, paths, h, schema);
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}
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private void ParseStep (string xpath, int pos, ArrayList steps,
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ArrayList paths, ValidationEventHandler h, XmlSchema schema)
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{
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pos = SkipWhitespace (xpath, pos);
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if (xpath.Length == pos) {
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error (h, "Empty xpath expression is specified");
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return;
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}
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XsdIdentityStep step = new XsdIdentityStep ();
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switch (xpath [pos]) {
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case '@':
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if (isSelector) {
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error (h, "Selector cannot include attribute axes.");
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currentPath = null;
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return;
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}
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pos++;
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step.IsAttribute = true;
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pos = SkipWhitespace (xpath, pos);
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if (xpath.Length > pos && xpath [pos] == '*') {
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pos++;
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step.IsAnyName = true;
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break;
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}
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goto default;
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case '.':
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pos++; // do nothing ;-)
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step.IsCurrent = true;
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break;
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case '*':
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pos++;
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step.IsAnyName = true;
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break;
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case 'c':
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if (xpath.Length > pos + 5 && xpath.IndexOf ("child", pos, 5) == pos) {
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int tmp = pos;
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pos += 5;
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pos = SkipWhitespace (xpath, pos);
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if (xpath.Length > pos && xpath [pos] == ':' && xpath [pos+1] == ':') {
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pos += 2;
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if (xpath.Length > pos && xpath [pos] == '*') {
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pos++;
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step.IsAnyName = true;
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break;
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}
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pos = SkipWhitespace (xpath, pos);
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}
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else
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pos = tmp;
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}
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goto default;
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case 'a':
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if (xpath.Length > pos + 9 && xpath.IndexOf ("attribute", pos, 9) == pos) {
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int tmp = pos;
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pos += 9;
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pos = SkipWhitespace (xpath, pos);
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if (xpath.Length > pos && xpath [pos] == ':' && xpath [pos+1] == ':') {
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if (isSelector) {
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error (h, "Selector cannot include attribute axes.");
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currentPath = null;
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return;
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}
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pos += 2;
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step.IsAttribute = true;
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if (xpath.Length > pos && xpath [pos] == '*') {
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pos++;
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step.IsAnyName = true;
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break;
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}
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pos = SkipWhitespace (xpath, pos);
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}
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else
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pos = tmp;
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}
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goto default;
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default:
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int nameStart = pos;
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while (xpath.Length > pos) {
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if (!XmlChar.IsNCNameChar (xpath [pos]))
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break;
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else
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pos++;
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}
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if (pos == nameStart) {
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error (h, "Invalid path format for a field.");
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this.currentPath = null;
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return;
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}
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if (xpath.Length == pos || xpath [pos] != ':')
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step.Name = xpath.Substring (nameStart, pos - nameStart);
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else {
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string prefix = xpath.Substring (nameStart, pos - nameStart);
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pos++;
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if (xpath.Length > pos && xpath [pos] == '*') {
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string ns = nsmgr.LookupNamespace (prefix, false);
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if (ns == null) {
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error (h, "Specified prefix '" + prefix + "' is not declared.");
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this.currentPath = null;
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return;
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}
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step.NsName = ns;
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pos++;
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} else {
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int localNameStart = pos;
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while (xpath.Length > pos) {
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if (!XmlChar.IsNCNameChar (xpath [pos]))
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break;
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else
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pos++;
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}
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step.Name = xpath.Substring (localNameStart, pos - localNameStart);
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string ns = nsmgr.LookupNamespace (prefix, false);
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if (ns == null) {
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error (h, "Specified prefix '" + prefix + "' is not declared.");
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this.currentPath = null;
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return;
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}
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step.Namespace = ns;
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}
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}
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break;
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}
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if (!step.IsCurrent) // Current step is meaningless, other than its representation.
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steps.Add (step);
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pos = SkipWhitespace (xpath, pos);
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if (xpath.Length == pos) {
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currentPath.OrderedSteps = (XsdIdentityStep []) steps.ToArray (typeof (XsdIdentityStep));
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paths.Add (currentPath);
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return;
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}
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else if (xpath [pos] == '/') {
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pos++;
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if (step.IsAttribute) {
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error (h, "Unexpected xpath token after Attribute NameTest.");
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this.currentPath = null;
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return;
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}
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this.ParseStep (xpath, pos, steps, paths, h, schema);
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if (currentPath == null) // For ValidationEventHandler
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return;
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currentPath.OrderedSteps = (XsdIdentityStep []) steps.ToArray (typeof (XsdIdentityStep));
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} else if (xpath [pos] == '|') {
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pos++;
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currentPath.OrderedSteps = (XsdIdentityStep []) steps.ToArray (typeof (XsdIdentityStep));
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paths.Add (this.currentPath);
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this.currentPath = new XsdIdentityPath ();
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this.ParsePath (xpath, pos, paths, h, schema);
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} else {
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error (h, "Unexpected xpath token after NameTest.");
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this.currentPath = null;
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return;
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}
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}
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private int SkipWhitespace (string xpath, int pos)
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{
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bool loop = true;
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while (loop && xpath.Length > pos) {
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switch (xpath [pos]) {
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case ' ':
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case '\t':
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case '\r':
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case '\n':
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pos++;
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continue;
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default:
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loop = false;
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break;
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}
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}
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return pos;
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}
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//<selector
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// id = ID
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// xpath = a subset of XPath expression, see below
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// {any attributes with non-schema namespace . . .}>
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// Content: (annotation?)
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//</selector>
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internal static XmlSchemaXPath Read(XmlSchemaReader reader, ValidationEventHandler h,string name)
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{
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XmlSchemaXPath path = new XmlSchemaXPath();
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reader.MoveToElement();
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if(reader.NamespaceURI != XmlSchema.Namespace || reader.LocalName != name)
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{
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error(h,"Should not happen :1: XmlSchemaComplexContentRestriction.Read, name="+reader.Name,null);
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reader.Skip();
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return null;
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}
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path.LineNumber = reader.LineNumber;
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path.LinePosition = reader.LinePosition;
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path.SourceUri = reader.BaseURI;
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XmlNamespaceManager currentMgr = XmlSchemaUtil.GetParserContext (reader.Reader).NamespaceManager;
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if (currentMgr != null) {
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path.nsmgr = new XmlNamespaceManager (reader.NameTable);
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IEnumerator e = currentMgr.GetEnumerator ();
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while (e.MoveNext ()) {
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string prefix = e.Current as string;
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switch (prefix) {
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case "xml":
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case "xmlns":
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continue;
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default:
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path.nsmgr.AddNamespace (prefix, currentMgr.LookupNamespace (prefix, false));
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break;
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}
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}
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}
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while(reader.MoveToNextAttribute())
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{
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if(reader.Name == "id")
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{
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path.Id = reader.Value;
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}
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else if(reader.Name == "xpath")
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{
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path.xpath = reader.Value;
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}
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else if((reader.NamespaceURI == "" && reader.Name != "xmlns") || reader.NamespaceURI == XmlSchema.Namespace)
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{
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error(h,reader.Name + " is not a valid attribute for "+name,null);
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}
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else
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{
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XmlSchemaUtil.ReadUnhandledAttribute(reader,path);
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}
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}
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reader.MoveToElement();
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if(reader.IsEmptyElement)
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return path;
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// Content: (annotation?)
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int level = 1;
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while(reader.ReadNextElement())
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{
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if(reader.NodeType == XmlNodeType.EndElement)
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{
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if(reader.LocalName != name)
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error(h,"Should not happen :2: XmlSchemaXPath.Read, name="+reader.Name,null);
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break;
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}
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if(level <= 1 && reader.LocalName == "annotation")
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{
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level = 2; //Only one annotation
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XmlSchemaAnnotation annotation = XmlSchemaAnnotation.Read(reader,h);
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if(annotation != null)
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path.Annotation = annotation;
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continue;
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}
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reader.RaiseInvalidElementError();
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}
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return path;
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}
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}
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}
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